Videotestsrc, input-selector and Segfaults.

[Martin Maurer]

Hi Eric,

I think it would be helpful, if you can share the C source code and some 
build instructions.

Have you tried gdb to locate the location of the crash?

Best regards,

Martin


Am 16.09.2017 um 02:33 schrieb Eric M:
> I'm using a pair of videotestsrc elements to simulate some other sources
> while doing some testing on the Pi3 (On Raspbian Stretch, Gstreamer 1.10).
>
> I noticed that when setting the following pipeline (See below) to playing in
> a C program, it will sometimes (about 10 out of 11 times) cause a segfault.
> It does not appear to cause a segfault if launched from gst-launch-1.0 (but
> I can't use the input-selector there), and it does not seem to cause a
> segfault if I specify format=RGB for both videotestsrc elements.  The
> segfault also goes away if I replace one videotestsrc with a different
> element like a udpsrc.  If the pipeline launches successfully, it will work
> perfectly.
>
> The segfaults will still occur if this pipeline is simplified, although they
> do seem to happen more rarely.  It's hard to pin down exactly what causes
> it.
>
> I'm curious, is specifying a format when using input-selector an requirement
> that I overlooked?  Or is more likely something going wrong during
> negotiation and forcing the format just happens to fix it?
>
> "videotestsrc pattern=black !
> video/x-raw,width=320,height=240,framerate=10/1 ! queue ! videoin.
> videotestsrc ! video/x-raw,width=640,height=480,framerate=10/1 ! queue !
> videorate ! video/x-raw,framrate=10/1 ! videoscale !
> video/x-raw,width=320,height=240 ! queue ! videoin. input-selector
> name=videoin ! textoverlay vertical-render=true  shaded-background=true
> valignment=center line-alignment=center halignment=center font-desc=\"DejaVu
> Sans Mono,48\" name=textinput ! videoflip method=2 ! videoconvert !
> fbdevsink device=/dev/fb1"
>
>
>
> --
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